// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#include "JobMgr.h"
#include "task/Task.h"
#include "TaskCreator.h"


namespace zilliz {
namespace milvus {
namespace scheduler {

using namespace engine;

JobMgr::JobMgr(ResourceMgrPtr res_mgr)
    : res_mgr_(std::move(res_mgr)) {}

void
JobMgr::Start() {
    if (not running_) {
        worker_thread_ = std::thread(&JobMgr::worker_function, this);
        running_ = true;
    }
}

void
JobMgr::Stop() {
    if (running_) {
        this->Put(nullptr);
        worker_thread_.join();
        running_ = false;
    }
}

void
JobMgr::Put(const JobPtr &job) {
    {
        std::lock_guard<std::mutex> lock(mutex_);
        queue_.push(job);
    }
    cv_.notify_one();
}

void
JobMgr::worker_function() {
    while (running_) {
        std::unique_lock<std::mutex> lock(mutex_);
        cv_.wait(lock, [this] { return !queue_.empty(); });
        auto job = queue_.front();
        queue_.pop();
        lock.unlock();
        if (job == nullptr) {
            break;
        }

        auto tasks = build_task(job);
        auto disk_list = res_mgr_->GetDiskResources();
        if (!disk_list.empty()) {
            if (auto disk = disk_list[0].lock()) {
                for (auto &task : tasks) {
                    disk->task_table().Put(task);
                }
            }
        }
    }
}

std::vector<TaskPtr>
JobMgr::build_task(const JobPtr &job) {
    return TaskCreator::Create(job);
}

}
}
}